devices: debug_port: Move 0x80 output to warn!() level

This allows the capturing of the debug port event without requiring more
verbose logging which itself has a performance impact.

Unless users are using our custom kernel or their own custom patches
they are unlikely to see the impact.

Signed-off-by: Rob Bradford <robert.bradford@intel.com>

devices/src/legacy/debug_port.rs

@@ -73,7 +73,7 @@ impl BusDevice for DebugPort {
         let elapsed = self.timestamp.elapsed();
 
         let code = data[0];
-        info!(
+        warn!(
             "[{} code 0x{:x}] {}.{:>06} seconds",
             DebugIoPortRange::from_u8(code),
             code,